Disable exact out for max balance payments

[GabrielePicco]

Summary

• Track the sender wallet balance in raw base units while preserving the existing formatted display.
• Detect when the entered payment amount equals the selected sender balance.
• Force exactOut to false and disable the Exact out switch for full-balance sends so token fees are not added on top of the sender's holdings.

Validation

• ./node_modules/.bin/tsc --noEmit
• yarn build

Note: npm run lint currently fails before linting because eslint . reports no files matching . in this checkout.

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Project	Deployment	Actions	Updated (UTC)
pay	Ready	Preview, Comment	May 27, 2026 7:48pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: cb7b0125-4813-4da0-a7d0-bc2e4c826aaf

📥 Commits

Reviewing files that changed from the base of the PR and between ab6e111 and ac0372c.

📒 Files selected for processing (1)

• components/one/payment-card.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/max-balance-exact-out

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